Hi there, Liz.
It's great to see that you are paying close attention to the details to ensure everything is recorded accurately. When your supplier issued the extra payments, QuickBooks automatically generated Supplier Credits for you. These credits are stored in Accounts Payable and can be applied to future bills, so there's no need for you to create them manually.

Since you have already created Supplier Credits, duplicates were created. You can delete the ones you made.
Here's how to delete the Supplier credit you manually created:
- Go to Expenses and choose Suppliers.
- From the list of suppliers, click to open their profile.
- Look for the row labeled Supplier Credit.
- Under the Action column, click the drop-down arrow and select Delete.

Once done, you can now match your transactions in QuickBooks Online.
If you have further queries, let us know. We're always here to help out.